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UNITED STATES PATENT oEEIoE.

RALPH BAKER, 0F WILKINSBUBG, PENNSYLVANIA, ASSIGNOB TO WESTINGBOUSEELECTRIC & MANUFACTURING COIPANY, A CORPORATION OF PENNSYLVANIA.

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To all lwhom it may concern:

Be' it known that I, RALPH BAKER, a citizen of the United States, land,a resident of Wlkinsburg, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement. in Weldin ofwhichY the following is a spec' My invention relatesto welding tools andparticularly to means for preventing the heating of the handles thereoThe object of my invention is to provide a tool, of the above indicatedcharacter, that shall be simple and inexpensive in construction andadapted for continuous operation, for long periods of time, withoutinconvenience to the operator, by reason of the heating of the handle.

Heating of the handles is, in many instances, the result of two causes,one of which, namely, the heat given olf by the arcs, appears to havebeen recognized and guardin which the leadingin conductors extendthrough the handles, another great source of heating is found. Theleading-in wires generate heat independentlv of the arcs and these twosources, combined, so heat the handles, in comparatha't they cannot behandled even with the aid -of'gloves.

In practising my invention VI provide a. welding tool that is soconstructed as to protect the handle thereof from the heat caused byradiationl and conduction from the arc, and that has the leading-incurrent conductor so supported from the handle that the heat generatedin the conductor is not conveyed to the same.1

Figure 1 of the accompanying drawings is a side view, partly in`elevation and partly 1n section, of a welding tool embodying myinvention, Fig. 2is an end detail view of the swivel supportlng membershown in Fig. 1,

Y and Fig. 3 is a side elevational view of anelectrode holder 2, that ispreferably constructed of brass, is supported at one end of a member 4that comprises a hollow perwww meer ment. Patented May 13, 1919.Application md number s, 1917. serial no. 200,041.

of a heat-resisting material, suchvas asbestos, and into 'one end ofahollow handle 7, of micarta or other suitable heat-insulating material.The handle 7 is attached to the shield 6 by screws 8 and is closed atits outer end by a plug 9. p

The rod 3 comprises sections '10 and 11, respectively of metal andmicarta that are joined by a screw threaded section 12. This arrangementprovides a metal clamping end for the rod 3 at the point at which itabuts the hotv electrodeand a heat insulating section at its portionthat extends into the handle 7.' The electrode-engaging end face of therod 3 is cupped, as shown at 3, thereby providing a sharp gripping meansthat is adapted to cut into the electrode to securely hold the latter inposition, thus preventing withdrawah of the samefwhen it becomes frozento the work. A springv13,acting between one end of the rod 3 and plug 9,actuates the rod 3 to hold the electrode 1 in the holder 2 and is, byits position and its ldrawal of the rod 3 from engagement with theelectrode.

"A swivel supporting device 16 depends from the handle 7 adjacent theplug 9 and comprises a strap-metal member 17 having a depending portion18 and screws 19 for securing the same `to the handle. Fig. 2 gives aclearer conception of the device 16 ythat -furthercomprises astrap-metal ring 20 having an offset portion 21. The portions 18 and 21are similar and each provided with concentric apertures through whichthey are loosely connected by a doubleheaded pin 22. The ring 20 isadapted to support an insulating bushing 23, through which thecurrent-supplying conductor 24 extends.` The conductor 24 extends fromthe bushing 23 to, and into, one end of a terminal bushing 25 that isscrewed into thc shield 6. The bushing 25 is provided with a'.screw 26by which it is secured to the conductor 24 and a screw-27 by which it issecured to one end of a rigid aluminum con- Y electrode orv filler-rodto melt and be thereductor 28. The other end of the conductor `28issecured-to the holder 2by a pin 29.

In operation,l one terminal of a Suitable supply-circuit (not shown) isattached to the article to be welded and the otherv terminal isconnected to the conductor 24. An ar'c is then struck between theelectrode 1 and the article to vbe welded, atthe point at which thewelding operation is vto be performed.' This'causes the material of theby permitted to drop into a'crevice to be filled or a fracture to berepaired. During this operation, heat is generated both a`t the arc; andin the leading-in conductor. This heat `is. prevented from reaching thehandle bythe arrangement and composition of the v quent burning of theholder where it engages the electrode. Y

The novel arrangement of the leading-in conductor fand shield may beembodied in a carbon-pencil welding tool, as shown in 3, in which a"solid wood vhandle 30 is vattached to a shield 6. A supporting rod 31 forthe carbon-pencil 32 is spaced from and -supported by the, shield 6through a' bracket 33'. v

The operationv and electrical connections of this form of tool aresimilar .to those of the former with the 'exception that the electrode32 is used only to strike and maintain the arc. The welding materiahorfiller-rod,

'in this instance, isla separate member, one

end of which is inserted in the arc.

' By the novel .correlation of materials, considered 'from the"'Standpoints of pro erties, disposition and. construction, a. 'higiilyefiic'ient welding tool lis obtained that' is .pro-

tected against both' arc heat and leading-in conductor heat and that maybe thereby con- WhileI have shown and described par- 66- ticular foimsofmy. invention, many changes mayvgbe. 'effected therein within the spiritandnscope of the same, as. set. forth in the appended claims. l I claimas my invention:

1. In a wel tool, the combination-with Y an electrode hol er and asupportingmember therefor," of ajheat-resistmghandle for the supportingmember, a conductor adapt# ed to lead current to 'the holder, and meansfor su porting the conductor in a position snaoedp from andYsubstantially parallel to ing member depending from the handle.

2. In a weldin tool,- the combination with an electrode hol er and asupporting membel` therefor, of a heatresisting handle for the holder, aconductor adapted to leadcurrent to the supporting member, and means-for supporting the conductor in a position spaced from andsubstantially parallel to the handle, comprising a supporting memberhaving a swivel connection to the handle.

,3. In a welding tool, the combination' with an electrode holder and asupporting member therefor, of a'heat-resisting handle for thesupporting member, a shield between the handle and the supportingmember, a conductor adapted to lead current to the holder,

the handle, comprising a movable supportand means for supporting theconductor in' a .position spaced from and substantially parallel to thehandle, comprising a movable supporting member associated with thehandle and la connector associated with the shield.

4. In a weldin tool, the combination with an electrode hol er and ahollow supporting member for the holder of a hollow heat-resistinghandle for the supporting member, and means movable in both the handleand the supporting member for engaging the electrode comprising a rod ofpart insulating and part conducting material.

5. In a welding tool, the combination with an electrode holder and ahollow supporting member for the holder of'a hollow heat-re.

sisting handle for the supporting member,

and means movable in both the handle and thesupporting member forholding the electrode in operative positlon comprising a rod hanng oneconducting and one 'insulating en f 7. A- su ortin membe .fo n lect od ptinuously operated for long periods of time. y pp g 'r r a' e r eholder, a hollow 'perforated heat insulated supportmg member for' theelectrode holder, ahollow .heat reslsting handle for the supportingmember, a heat-resisting shield posi-- tioned between the electrode"supporting member and the h andle, a rod Vholdingthe electrode 1nposltion'that extends through to supply current to the rangement andproperties of the different the supporting member and partly through thehandle and is composed of conducting material at its end adjacent theelectrode and of insulating material at its opposite' end,

and means for supporting a conductor outside the handle and thesupporting member electrode, the arelements being so related as toprevent the heating of the handle either by conduction 1o or convectionof arc heat or by heat generated in the leading-in conductor.

In testimony whereof, I have hereunto subscribed my name this 27th dayof Oct.l

RALPH BAKER.

